from rest_framework import serializers

# serializers.ModelSerializer
# serializers.Serializer
from goods.models import SKU


class CartSerializer(serializers.Serializer):

    sku_id = serializers.IntegerField(label='sku_id', required=True, min_value=1)
    count = serializers.IntegerField(label='数量', required=True, min_value=1)
    selected = serializers.BooleanField(label='是否勾选', required=False, default=True)

    def validate(self, attrs):

        # 判断商品是否存在
        sku_id = attrs['sku_id']
        try:
            sku = SKU.objects.get(pk=sku_id)
        except SKU.DoesNotExist:
            raise serializers.ValidationError('商品不存在')
        # 判断库存是否充足
        count = attrs['count']
        if sku.stock < count:
            raise serializers.ValidationError('库存不足')

        return attrs


class CartSKUSerializer(serializers.ModelSerializer):
    count = serializers.IntegerField(label='数量')
    selected = serializers.BooleanField(label='是否勾选')

    class Meta:
        model = SKU
        fields = ['id','name','count','selected','price','comments','default_image_url']


class CartSKUIDSerialzier(serializers.Serializer):
    sku_id = serializers.IntegerField(required=True,min_value=0)